There is plenty of evidence that "second-hand" smoke - breathed when you are in the same room as someone smoking - can be harmful, particularly to children, and some parents adopt a strategy of never smoking in their child's presence.
For example, if one had never smoked or had quit smoking more than 12 months ago, one got 1 point.
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Zyban, a GlaxoSmithkline antidepressant used for smoking cessation, never took off.
And I think the other thing that we struggle with is there has never been a study that showed smoking is good.
"They're never easy cases, there's no smoking gun, " ACLU of Arizona legal director Dan Pochoda said of the class-action suit.
Finally, being a "smoking pariah" now, with never a day in hospital in my life, I feel that any treatment I may need in the future has long been covered by my income tax and duty paid on tobacco, so now I'm only smoking (legally obtained) duty free tobacco.
Take 50 supposedly abnormal films and shuffle them with 50 taken from people never exposed to asbestos but matched in sex, age and smoking habits.
Research has repeatedly shown that low social interaction is as bad for your health as smoking 15 cigarettes a day, being an alcoholic or never exercising, and it is twice as bad for your health as obesity.
We create these problems in the full knowledge that smoking is a killer, that drink destroys your liver, that obesity never going to be good for your heart.
But Gloria Swanson never did, though he stayed at her Park Avenue apartment, carefully not drinking and not smoking, and suffered her to tease him with rack after rack of costumes from her films.
Anti-smoking charity Ash described the research as "chilling" and as a warning that it is never too early to quit.
They were left "scrabbling" around to try and find a "smoking gun" in a short period of time, he said, while the UK and US had never "recovered" from the fact that no WMD were found after the invasion.
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